The prevalence of insomnia in the general population in China: A meta-analysis Cao, Xiao-Lan ; Wang, Shi-Bin ; Zhong, Bao-Liang ; Zhang, Ling ; Ungvari, Gabor S. ; Ng, Chee H. ; Li, Lu ; Chiu, Helen F. K. ; Lok, Grace K. I. ; Lu, Jian-Ping ; Jia, Fu-Jun ; Xiang, Yu-Tao Abstract Publication: PLoS ONE Pub Date: February 2017 DOI: 10.1371/journal.pone.0170772 Bibcode: 2017PLoSO..1270772C